So, I simply looked on the internet for some Christmas song parodies, in anime version. So these are just some Christmas song parodies I found on the internet, not necessarily anime anymore.

Attack on Titan:

Titan Claus Is Coming To Town

Cannon Shells

Flying through the town
On a not-so-stocked up gas
Titans are attacking
And Armin's on his ass (hahaha!)

Titans everywhere
The deaths are rising up
Sasha doesn't even share
And Erin's Levi's pup

Oh, cannon shells
Reiner smells
Annie ran away
Marco dies
Armin cries
Levi all the way, hey!

Jean is such a horse
Marco's split in two
Annie just went titan
What does she plan to do? (Whahaha)

The whole right flank is gone
There's nowhere left to hide
Annie just kill them all
And Levi's PETRAfied

Oh, cannon shells
Reiner smells
Annie ran away
Marco dies
Armin cries
Levi all the way, hey!

12 Days Of Christmas

Armin the bwop-nosed Shota (90% of the songs I could find where from AoT)

Armin the bwop-nosed Shota
Had a very tiny nose
And if you ever saw it
You'll forget all of your woes
All of the scary titans
Used to eat his closest friends
They never let poor Armin
Murder them to seek revenge
Then one Levi's Birthday-Eve
Erwin came to say
"Armin with your nose so small,
Won't you help reclaim the walls?"
Then how the soldiers loved him
And they shouted out with glee,
"Armin the bwop-nosed Shota,
You'll lead us to victory!"

Diabolik Lovers: (Mistyaaml4ever, I never told you, but I do like the series.)

Jingle Bells (credit to someone naming themselves Fabian In Wonderland)

Verse:
Laito is a bitch
Subaru is a car
Ayato is a spoiled brat
We all know who they are

The pigeon wears glasses
The lazy ass is sleeping
Kanato is a creep
And Yui is weeping

Chorus:
Oh Jingle Bells
Karl Heinz smells
Shu just slept all day
Yui died
Ayato cried
Subaru just walked away, hey!

Ouran High School Host Club:

12 Days Of Christmas

On the first day of Christmas the host club gave to me:

A cup of commoners coffee

On the second day of Christmas the host club gave to me:

2 twins for twincest
And a cup of commoners coffee

On the third day of Christmas the host club gave to me:

3 years of service
2 twins for twincest
And a cup of commoners coffee

On the fourth day of Christmas the host club gave to me:

4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the fifth day of Christmas the host club gave to me:

5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the sixth day of Christmas the host club gave to me:

6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the seventh day of Christmas the host club gave to me:

7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the eight day of Christmas the host club gave to me:

8 wounded sparrows
7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the ninth day of Christmas the host club gave to me:

9 words from Mori
8 wounded sparrows
7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the tenth day of Christmas the host club gave to me:

10 cakes for Honey
9 words from Mori
8 wounded sparrows
7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the eleventh day of Christmas the host club gave to me:

11 peels to slip on
10 cakes for Honey
9 words from Mori
8 wounded sparrows
7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

On the twelfth day of Christmas the host club gave to me:

12 girls for hosting
11 peels to slip on
10 cakes for Honey
9 words from Mori
8 wounded sparrows
7 shots of vodka
6 pills for migraines
5 sexy men
4 fangasms
3 years of service
2 twins for twincest
And a cup of commoners coffee

Death Note

Santa Claus is Coming To Town (really short)

Haikyuu!!

12 Days Of Christmas

Harry Potter

Voldemort is Coming To Town

The Hunger Games

Jingle Bells

Jingle Bells
Quarter Quells
Happy Hunger Games
Peeta dies
Katniss cries
And Finnick saves the day, oh

Simply random parodies

Jingle Bells

More Jingle Bells

Another Jingle Bells

...should I question my sanity?

Anyways, MERRY CHRISTMAS, EVERYONE! I know some of you aren't having the best Christmas, but I know you all can get through this. And I want you all to see how wonderful you are.

I love you all, and have a very merry Christmas.